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  <p>
    Reports unresolved command field references in localisation files.
  </p>
  <p>
    Localisation command field reference "FIELD" can be following situations currently:
  </p>
  <ul>
    <li>
      A localisation command named <code>"FIELD"</code> (ignore case).
    </li>
    <li>
      A script loc definition named <code>"FIELD"</code> (ignore case).
    </li>
    <li>
      A variable named <code>"FIELD"</code> (ignore case).
    </li>
  </ul>
  <!-- tooltip end -->
  <p>
    Localisation commands are predefined by CWT Config (in <code>localisation.cwt#localisation_commands</code>)
  </p>
  <p>
    A script loc definition is a definition with type <code>"script_loc"</code>.
  </p>
  <p>
    A variable is a script expression matching CWT expression <code>"value[variable]"</code> or <code>"value_set[variable]"</code>.
  </p>
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